/Engine/Source/Runtime/MovieScene/Public/Channels/MovieSceneChannelProxy.h
Find the index of the specified channel ptr in this proxy
The index of the channel if found, else INDEX_NONE
int32 FindIndex ( [FName](API\Runtime\Core\UObject\FName) ChannelTypeName, const [FMovieSceneChannel](API\Runtime\MovieScene\Channels\FMovieSceneChannel) * ChannelPtr ) const